Ebasto Air Top Evo 3900 Workshop Manual - page 24
5 Troubleshooting
Air Top Evo 3900/5500
504
Error
code
Error (group)
Additional information during PC
diagnostic
Troubleshooting
F 07
Metering pump interrupt or
metering pump short-circuit
88
Break or short circuit to +Ub
08
Short circuit to earth
Check cables, replace metering pump
Check cables, replace metering pump
F 08
Fan motor interrupt or fan motor
short-circuit or fan motor overload
or fan motor blocked
89
Break or short circuit to +Ub
09
The switched drive unit cable
(combustion and hot air blower) has a
short circuit to earth or the drive unit is
overloaded
15
Burner motor block guard has tripped
95
Burner motor not turning easily sensor
has tripped
Replace drive unit (combustion and hot air
blower)
Eliminate the cause of the blockage /
difficulty in movement
Replace drive unit (combustion and hot air
blower)
F 09
Glow plug interrupt or glow plug
short-circuit
8A
Glow plug/Flame monitor: Break or
short circuit to +Ub
19
Glow circuit: The switched cable of the
element has a short circuit to earth
Replace glow plug / flame monitor
Replace glow plug / flame monitor
F 10
Overheating
06
The overheating fault lock-out has
tripped (heater overheated)
17
Incorrect application or illegal insulation
(OHS gradient too high)
Find and remove the cause of the
overheating
NOTE
If no other cause can be found for the
overheating, the pressure losses caused
by the hot air distribution (too many
resistance points) are too high or a hot air
filter is soiled
F 11
Overheating sensor interrupt or
overheating sensor short circuit
AB
Overheating sensor circuit:
break or short circuit to +Ub
1B
Overheating sensor circuit:
the switched cable of the element has a
short circuit to earth
Replace overheating sensor
Replace overheating sensor
F 12
Heater unit lock-out
07
The permanent heater fault lock-out
has been activated
Heater unit is switched on,
Fault code F12 is shown.
Remove fuse.
Switch off heater unit with heater control.
Insert fuse again after more than 2
seconds.
Switch on heater unit again with heater
control.
NOTE
The following error has occurred several
times:
Fault counter more than 5 times
Incorrect start counter more than 9 times
Flame failure counter more than 5 times
F 14
Overheating sensor incorrect
position
97
Incorrect position of the overheating
sensor (OHS gradient too low)
Position the overheating sensor correctly
F 15
Setpoint generator short circuit
9B
Nominal value potentiometer circuit
break or short circuit to + Ub
Check cables, replace control element
Fig. 503 Troubleshooting (page 2 of 2)